chez,
i did consider that which is why i gave him only 6 outs instead of the normal 8. 6 that complete the straight and not the flush.

if you have 8c 9c and your opponent has Ad 3d and the flop is
7d Td 2c i am not counting the Jd and the 6d as outs, only the Jc Js Jh and the 6c 6s 6h. i am saying if the turn comes a 6c your opponent still has a 4;1 shot of winning the hand, so you might want to think about it as 5 outs on the flop when you try to draw.